#include "csapp.h"  
#define N 2  
void *thread(void *vargp);  
  
char **ptr;  /* global variable */  
  
int main()   
{  
    int i;    
    pthread_t tid;  
    char *msgs[N] = {  
    "Hello from foo",    
    "Hello from bar"     
    };  
  
    ptr = msgs;   
    for (i = 0; i < N; i++)    
        Pthread_create(&tid, NULL, thread, (void *)i);   
    Pthread_exit(NULL);   
}  
  
void *thread(void *vargp)   
{  
    int myid = (int)vargp;  
    static int cnt = 0;  
    printf("[%d]: %s (cnt=%d)\n", myid, ptr[myid], ++cnt);  
} 